Make a deatailed comparative study on steps taken by government against pollution in three most polluted cities in the world
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India's capital Delhi is blanketed under a hazardous shroud of air pollution.
City authorities have imposed a car rationing scheme in a bid to bring levels down, but experts believe the real blame lies with crop burning by farmers in neighbouring states.
Delhi is the latest city to try to come up with ways to tackle increasingly dangerous pollutants in the air.
This is what other cities have done in a bid to beat air pollution.
Thick smog used to frequently blanket the UK capital in the 19th and 20th centuries, when people burned coal to warm homes and heavy industry in the city centre pumped chemicals into the air.
Referred to as "pea-soupers", the most famous of these events was the so-called Great Smog of London in 1952. It was recently dramatised in the first series of the Netflix drama, The Crown.
Cold weather in the preceding days meant people had burned more coal - often of low quality, which released more sulphur dioxide - while inner-city coal power stations added to the haze. An anticyclone then settled over London, trapping cold air under a layer of warm air.
The smog lowered visibility to a few feet and, over four days, is thought to have killed more than 10,000 people.
What was the solution?
In 1956 the UK passed the Clean Air Act.
It regulated both industrial and domestic smoke, imposing "smoke control areas" in towns and cities where only smokeless fuels could be burned and offering subsidies to households to convert to cleaner fuels.
China's rapid industrialisation brought a huge rise in air pollution.
Coal-burning power stations and a boom in car ownership from the 1980s onwards filled Beijing's air with hazardous chemicals.
In 2014, a report by the Shanghai Academy of Social Sciences said the city was nearly "uninhabitable for human beings" because of the pollution.
What was the solution?
Years of hard work.
A UN report this year shows that in the space of just four years, between 2013 and 2017, fine particle levels in Beijing dropped by 35%, while levels in surrounding regions dropped by 25%. "No other city of region on the planet has achieved such a feat," the report says.
But this was because of measures introduced and refined over the course of two decades, beginning in 1998.
City authorities have imposed a car rationing scheme in a bid to bring levels down, but experts believe the real blame lies with crop burning by farmers in neighbouring states.
Delhi is the latest city to try to come up with ways to tackle increasingly dangerous pollutants in the air.
This is what other cities have done in a bid to beat air pollution.
Thick smog used to frequently blanket the UK capital in the 19th and 20th centuries, when people burned coal to warm homes and heavy industry in the city centre pumped chemicals into the air.
Referred to as "pea-soupers", the most famous of these events was the so-called Great Smog of London in 1952. It was recently dramatised in the first series of the Netflix drama, The Crown.
Cold weather in the preceding days meant people had burned more coal - often of low quality, which released more sulphur dioxide - while inner-city coal power stations added to the haze. An anticyclone then settled over London, trapping cold air under a layer of warm air.
The smog lowered visibility to a few feet and, over four days, is thought to have killed more than 10,000 people.
What was the solution?
In 1956 the UK passed the Clean Air Act.
It regulated both industrial and domestic smoke, imposing "smoke control areas" in towns and cities where only smokeless fuels could be burned and offering subsidies to households to convert to cleaner fuels.
China's rapid industrialisation brought a huge rise in air pollution.
Coal-burning power stations and a boom in car ownership from the 1980s onwards filled Beijing's air with hazardous chemicals.
In 2014, a report by the Shanghai Academy of Social Sciences said the city was nearly "uninhabitable for human beings" because of the pollution.
What was the solution?
Years of hard work.
A UN report this year shows that in the space of just four years, between 2013 and 2017, fine particle levels in Beijing dropped by 35%, while levels in surrounding regions dropped by 25%. "No other city of region on the planet has achieved such a feat," the report says.
But this was because of measures introduced and refined over the course of two decades, beginning in 1998.
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